Hi, Junaidi here.
How I did my portrait? Well, I am really a beginner in this. Thanks to Ivan Chiok for assisting me. Apparently, from the template from Clement’s definition, I toggled the circle on, and it calculated in producing bigger circles on dark areas and small ones on lighter areas. After baking it, I transfered it to Illustrator and add colour to the circles. Though it might be simple and I might just know a few things about the grasshopper definition, I believe I am starting to get it. Will, improve on the portrait soon.